/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.config;

import java.io.InputStream;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Created by   on 2017/1/5.
 */
public final class ConfigMapping {
    private static Map<String, Object> configMap = null;

    static {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        InputStream is = loader.getResourceAsStream("mapping.yaml");
        configMap = YAMLUtil.yaml2Properties(is);
    }

    private ConfigMapping() {
    }

    public static String map(String key) {
        return (String) configMap.get(key);
    }

    public static Map<String, Object> getMapping() {
        return configMap;
    }

    public static Map<String, Object> getConvertedMap(Map<String, Object> oldMap) {
        if (configMap == null) {
            return new LinkedHashMap<>();
        }
        Map<String, Object> retMap = new LinkedHashMap<String, Object>();
        retMap.putAll(oldMap);
        for (Map.Entry<String, Object> entry : configMap.entrySet()) {
            String key = entry.getKey();
            Object configValue = oldMap.get(key);
            if (configValue != null) {
                String newKey = (String) entry.getValue();
                retMap.put(newKey, configValue);
                retMap.remove(key);
            }
        }
        return retMap;
    }
}
